E-Flora BC: Electronic Atlas of the Flora of British Columbia

Species description:
Genus named in honour of a Durch gardener, D. Meese. Species name describing the leaf arrangement in three neat rows (three­angled).

Reproduction:
Sporophytes infrequent, red-brown when ripe.

Distinguishing characteristics:
The most striking feature is the regularly three-rowed arrangement of the leaves that are dark green and strongly divergent from a somewhat sheathing base. These features, plus the wet calcareous habitat are usually enough to separate this moss.

Habit:
Tall to short turfs of dense to loosely compacted, unbranched, shoots in which the dark green leaves are strongly divergent when wet and are in three rows, making leafy shoots appear three-angled when viewed from above.

Similar Species:
Some specimens of Dichodontium pellucidum have leaves that are structurally similar to the Meesia but they are never in three distinct rows, as in Meesia. Oxystegus tenuirostris and Oncophorus virens may also superficially resemble M. triquetra but their leaves are never in three rows.